161605036258177 has 2 divisors, whose sum is σ = 161605036258178. Its totient is φ = 161605036258176.

The previous prime is 161605036258037. The next prime is 161605036258217. The reversal of 161605036258177 is 771852630506161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152770564081521 + 8834472176656 = 12360039^2 + 2972284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161605036258177 is a prime.

It is a super-2 number, since 2×161605036258177² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161605036258277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80802518129088 + 80802518129089.

It is an arithmetic number, because the mean of its divisors is an integer number (80802518129089).

Almost surely, 2^{161605036258177} is an apocalyptic number.

It is an amenable number.

161605036258177 is a deficient number, since it is larger than the sum of its proper divisors (1).

161605036258177 is an equidigital number, since it uses as much as digits as its factorization.

161605036258177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 161605036258177 in words is "one hundred sixty-one trillion, six hundred five billion, thirty-six million, two hundred fifty-eight thousand, one hundred seventy-seven".